Nutshell cleanup wishlist #73

Job	Run time
checks / mypy	49s
checks / formatting	21s
checks / ruff	6s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	2m 56s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	2m 42s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	2m 35s
tests (ubuntu-latest, 3.10, 1.7.1, FakeWallet) / poetry	1m 40s
tests (ubuntu-latest, 3.9, 1.7.1, FakeWallet) / poetry	1m 43s
	12m 52s

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